1615 codigo de barras (#1648)

* Fixes #1646

* Fixes #1615

* Gera código de barras no recibo de envio de proposição

sapl/materia/views.py

@@ -826,8 +826,14 @@ class ReciboProposicaoView(TemplateView):
             # FIXME hash para textos articulados
             _hash = 'P' + ta.hash() + '/' + str(proposicao.id)
 
+        from sapl.utils import create_barcode
+        base64_data = create_barcode(_hash, 100, 2000)
+        barcode = 'data:image/png;base64,{0}'.format(base64_data)
+
+
         context.update({'proposicao': proposicao,
-                        'hash': _hash})
+                        'hash': _hash,
+                        'barcode': barcode})
         return context
 
     def get(self, request, *args, **kwargs):

sapl/templates/materia/recibo_proposicao.html

@@ -67,5 +67,6 @@
     </tr>
     <tr> <td align="center"><br /><br /><br /><b>________________________________________________________________</b></td> </tr>
     <tr> <td align="center">{{proposicao.autor}}</td> </tr>
+    <tr> <td align="center"><img src="{{barcode}}"width="600px" height="50px"/></td> </tr>
   </table>
 {% endblock detail_content %}

sapl/utils.py

@@ -230,17 +230,17 @@ def get_base_url(request):
     return "{0}://{1}".format(protocol, current_domain)
 
 
-def create_barcode(value):
+def create_barcode(value, width=170, height=50):
     '''
         creates a base64 encoded barcode PNG image
     '''
     from base64 import b64encode
     from reportlab.graphics.barcode import createBarcodeDrawing
-
+    value_bytes = bytes(value, "ascii")
     barcode = createBarcodeDrawing('Code128',
-                                   value=value,
+                                   value=value_bytes,
-                                   barWidth=170,
+                                   barWidth=width,
-                                   height=50,
+                                   height=height,
                                    fontSize=2,
                                    humanReadable=True)
     data = b64encode(barcode.asString('png'))